Lexus dealer will inspect the car for a little over $120 or so. If you make an appointment it shouldn't take long. I believe they do the same inspection that they do when they take in a used car in trade. It's probably worth it if you can work that out.
Another inspection might be by a body shop to check for any repairs, repainted areas, etc. We used to take a magnet and go over some parts of the car to see if there was Bondo anywhere. That won't work on the hood because it's aluminum, but it would on the other body parts.
Carfax is ok, but they aren't totally accurate. They depend on body shops and police reports for accident and repair records, and not all of those report to Carfax.