how to pass where clause as a parameter into $this->model->getRows() in laravel5

I copy and pasts this code from another source to my laravel project and it works well to retrieve all values of a table.
Now I would like to pass "where is_active=1" as a parameter to $this->model->getRows();

How can I do this? Below is my code:

  $params = array(
            'page'      => $page ,
            'limit'     => (!is_null($request->input('rows')) ? filter_var($request->input('rows'),FILTER_VALIDATE_INT) : static::$per_page ) ,
            'sort'      => $sort ,
            'order'     => $order,
            'params'    => $filter,
            'global'    => (isset($this->access['is_global']) ? $this->access['is_global'] : 0 )
        );
        // Get Query 
        $results = $this->model->getRows( $params );

via Chebli Mohamed