Although I've lately been obsessed with Thai food and Thai town, that's going to be a very tight schedule for you and probably not worth the stress. It's going to take time for you to get the car and return the car in addition to the transit. Traffic should not be completely obscene between 10am and 1pm but there will be some. I would expect it to take you at least 45 minutes each way. If you were committed to it, you could probably call in an order, scarf it down, drive back (if you're going for food), but that seems rather harried. What are you looking for? There are other good places that are easier to make on a 3 hour roundtrip from LAX.