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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d0f367ac0b7d8b49f7cf5c487976ba77ebd28bce5b187d7701a1fe87bc465e3' 
  AND token = '6IjGp+xnyFoPGuqKRnhPKUo2SKyZ1qntNollufmey8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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