SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f1f169d5acf68937617fcfd4f3342a97b3e3b33b94d794f047c16556ac728e9' 
  AND token = 'BPPVZYTH/MCnqgviXqLRSlbra51DQWYw4lyVqxofkuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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