Action url to pass parameters to route

I've a form in my view with two selects that I use to filter PRODUCTS by category or (not and) by shop.

I try to make the route url in this way:

/products/{filter}/{key}

Where filter is category or shop and key the slug of related item. Some example:

/products/category/tablet

/products/category/mac

or

/produtcs/shop/eprice

/products/shop/amazon

Then in my route I think something like:

Route::get('/products/{fitler}/{key}', 'PageController@produtcs');

The question

How can I generate the action url in the form to make this route working?

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