I gotta tell ya, everything suggested so far is much more work
and expense than just cutting into the concrete and laying some cable.
With a rented quickie saw, it should take you about 15 minutes to cut
two grooves in the concrete. Then take a cold chisle and knock it out.
I would try and lay romex cable instead of conduit. With conduit, you
run the risk of moister collection with no way of draining. Run a 4
wire
12 guage, just in case you want 2 circuits.
Lou