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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7b1476bd3f06db3d9f1552864649bcc59e01edbd88e5cd6dd54277cbf1e4bbc' 
  AND token = 'D1rCCpizg5Q18Xr7gvnRHhMjd+I/3Xe9EGfy+NKxqL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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