The whole point of keto is for your body to use stored fats as an energy source and not glucose.
Those 30g come from peanut butter, green veggies and the occasional gram here or there from salad dressing. If a veggie has a carb rating of 4 grams but fiber off 3 grams it's net carb is 1 gram. It's practically impossible to eat to many veggies and carb out. So I get plenty of carbs just no sugar.
My macros I try to hit daily are
190g fat
160g protein
30g carb
I also fast 14 hours daily so from about 7-8 pm until about 11 the next morning no anything.