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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce09ae1f39f7024645a68cccf45cd95ffbca9ce1a25a82d9473fa488ae64e47b' 
  AND token = 'Xqc1toPoDe3XwC1Pw56zn2ybs8Rbfi6U3rbxbukCnd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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