This procedure is called Angiography and I had this done for my dad after he was suffering with lack of stamina and heavy breathing even with mild exertion. The doctors found 5 blockages which wasn't surprising since he used to be a smoker and a foodie. Multiple stents were put (couple of blockages were so bad that the couple of wires used to make way for the stent bent and couldn't penetrate but thankfully they were not in the bigger arteries).

I've resolved to undergo Angiography, symptoms or not, once I turn forty. Angiography is not cheap but it is way more cheaper considering the costs of stents (specifically the ones that dissolve are quite expensive). A day of preparation and an hour of discomfort is nothing at all considering the benefits.