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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cddbfada5fe43aebacc0a1ab78228f45d47afb6f28ac3954ac3b783f2ec6e39a' 
  AND token = 'Q6m2vJLETKF/rrtD0uPvFsRFcNFd7PJwWWaDOL7TQbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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