Toddler proof car seat?

Does such a thing exist, or do all parents rely on their toddlers
understanding they're not supposed to unlatch the car seat?

2 yo DD does understand it to the extent she yells "Open!" when she's
unlatched it, but she seems to have a short memory and doesn't recall
the scolding next time we're in the car. Doesn't help that it's
usually when we're on the highway, often in a place that's hard to
pull over.I always do, as soon as safely possible, but no matter how
much I scold, explain, etc, she still does it the next time. She
honestly seems so innocent as she's doing it - it's not like she's
testing me (she does do that with other things), it's more like she's
fascinated with the latching mechanism.

So, are there car seats that a 2 year old can not open?