There is very little to wear out, and that is the point of buying one used. An electric drivetrain has no belts, no gearbox to speak of, no oil services and no exhaust, so the mechanical inspection is short by nature. What matters instead is the battery and the software: confirm the state of health, ask how quickly the car takes a rapid charge when the pack is warm, check that it is running current software, and confirm what remains of the battery and drivetrain warranty and whether it transfers to you. Brakes, bushes and tyres deserve a look too, because a heavy car with instant torque works all three harder than you would expect.