Does Lowes carry a plant food called 10, 10, 10?

Yes, they should...10, 10, 10 is probably not the name but the ratio of the various nutrients found within the fertilizer/plant food itself. Many different types of feed contain that particular ratio. If they do not have it there though, there is a hydroponics plant store off Columbia Rd. that most likely will.

many varieties of plant food with various combinations of nitrogen, phosphorous and plant specific nutients.

Yes they do.

I would still call to confirm they have it in stock.

Yes