SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0947556bb21fc4b912fea051cc1b3077250f1543ed9de8eb93513f8ac388b7e7' 
  AND token = 'BYbjzhIYID1SY//0A4a6hwoZy/j6y59Xx6V78PQLqUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}