querying data via $wpdb and get_row

Try this.

$query = "SELECT * FROM wp_cf7dbplugin_submits a,wp_cf7dbplugin_submits b  WHERE a.field_name="Buyer" AND a.field_value = 1 AND a.submit_time = b.submit_time AND b.field_name = carbrand AND b.field_value="Mercedes"";

global $wpdb;
// return the number of rows found
$results = $wpdb->num_rows($query);
var_dump($results);

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