Lay fan fold foam insulation on the lower side. It will stop some of the cold coming through the slab.
You do know when installing laminite over a slab you will need a vaper barrier and will need to glue all the joints?
I would strongly suggest you go look at the Allour brand strip flooring sold at Home depot before buying the laminite. Over a slab it needs no prep, There no seams going to show if you take your time, it's waterproof unlike laminite, can be installed with nothing more then a pair of tin snips.
I installed it in my own kitchen and love it. There's no hollow sound when walking on it, does not flax. I did my whole 12 X 12 kitchen in an hour.