Caching only pages without query string

Is there a way to save the cache only for pages without querystring in the url?

Example: 

www.site.com/product (cache yes)

www.site.com/product?cat=4&dr=45 (cache no)

PHP Code:

// app/Config/Cache

public $cacheQueryString = true;


// in the controller

if (! $this->request->getGet('cat') && ! $this->request->getGet('dr')) {
    $this->cachePage(100); 
} 


Maybe there is an easier solution.