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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb8d9ce81d44ee10b9c2345f2711f2dc4821703ddbb773c54978bcc516df53e' 
  AND token = 'AgqBbOMeuRpmcpgYmmFps/0QjtVvU8JVBTcX8TtYjWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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