Either model in a way that the subdiv doesn't have edges dramatically sliding around and stretching the UVs when smoothed or Subdivide once before UVing/texturing
What do you mean with it is for production? Just from the little context i see, i assume you mix up the terms lowpoly and basemesh? So you wanna unwrap the basemesh, but preview that unwrap subdivided. Dependent on your smoothing algo, yes UVs might change between basemesh and subdivided mesh, in some cases drastically.…