Well as a point of reference:
1 cup of corn has approx. 41 grams of carbs, 5 of which are fiber, so 36 net Carb grams.
2 cups of iceberg lettuce in about 3.4 grams (lettuce is one of the lowest carb vegetables), and about half of that is fiber.
60 grams of carbs (or about 38 net grams, in this case) is unlikely to allow your body to go into ketosis, but it is a heck of a lot better than going a lot higher. Most Ketogenic diet guidelines recommend you stay between 15 - 30g of net carbohydrates per day, or 5-10% of total calories.
But, for example, if you substituted 1 cup broccoli for 1 cup of corn, you would have had something like 11 or 12 grams of carbs (vs 41), and 6 net grams (rather than 36).
Theoretically, the broccoli and lettuce combo would allow you to go into ketosis (if prolonged).
For those who are interested in the glycemic index:
The glycemic index of corn is about 53 which falls under medium GI category.
The glycemic index of lettuce is 15 which falls under low GI category.
The glycemic index is a value assigned to foods based on how slowly or how quickly those foods cause increases in blood glucose levels. Foods low on the glycemic index (GI) scale tend to release glucose slowly and steadily. Foods high on the glycemic index release glucose rapidly. Low GI foods tend to foster weight loss, while foods high on the GI scale help with energy recovery after exercise.
As additional information - the glycemic index of broccoli is also 15 (low GI category).
[Edited to correct a typo error]
Here is some (very incomplete) information on the glycemic index.
Just for grins, you might see if you can hit about 30 grams of carbs/day for a week - and see how you feel.
Since ... you asked.