what should I use to optimize my query in my webpages?

$path = MODX_CORE_PATH . 'components/mod1/';
$result = $modx->addPackage('mod1',$path . 'model/','mod_');


$output = null;
$urlresult = "A";   

/*for the A-Z drug search*/
if(isset($_GET['alpha'])){
if ((strlen($_GET['alpha'])!=null)||($_GET['alpha'])!=0){
$urlresult = $_GET['alpha'];
}
}

$query = $modx->newQuery('Tblbook');
        $query->select(array (
            'Tblbook.brand_name',
            'Tblbook.system_product_id',
            'Tblbook.system_brand_id',
            'TBOOKS.content',
            'TBOOKS.description',
            'TBOOKS.long_indication'
         

        ));
   
        $query->innerJoin('Tblbooks', 'TBOOKS', array(" Tblbook.system_brand_id = TBOOKS.system_brands_id")); 
        $query->where(array("Tblbook.brand_name:LIKE" => "$urlresult%"));
        $query->groupby('brand_name');
         
        $products = $modx->getCollection('Tblbook',$query); 
    

$search = $modx->query("SELECT b.form_class, a.system_brand_id, a.system_product_id, b.company, a.system_edition_id, a.brand_name, b.content, c.section1_id, c.section2_id, c.section3_id, c.section4_id,
MATCH (tfv_records)AGAINST ('$xkeywordx' IN BOOLEAN MODE) AS relevance
FROM mod_tfvrecords a, mod_tblcontents b, mod_tblproductcategory c
WHERE MATCH (tfv_records)AGAINST ('$xkeywordx' IN BOOLEAN MODE)
AND a.system_brand_id = b.system_brands_id
AND a.system_product_id = c.system_product_id GROUP BY a.system_product_id HAVING relevance > 0.1 ORDER BY relevance DESC LIMIT 50");