Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaaf899a75897c91cf743a9531d21882ace35620375a90fbca1f7bdcbde30460' 
  AND token = 'lm4Yvowo/GtTAvUQ5ceiL9f8pNzWDMW00xc+xExfA5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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