Is "Buy Now" button effective for product listing on mobile ecommerce?

I know there are similar questions regarding effectiveness of "Add to cart" button on product listing. But their context is for desktop web design.

What I'm asking is specifically for mobile interface which has no hover gesture on cards/lists, therefore the "Buy Now" button always shown on each card. The button also direct you to checkout instead of just putting it on shopping cart. So the button serve a purpose for user who just want to buy single product in quick steps.

So, anyone did a research for this? I would like to know if it actually increase conversion or there are any better alternatives.