Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd7b5a1bd917571e6ff0abec84bf44dcd64ddfca7029ff5ae0395a67715bba33' 
  AND token = 'd0HfSfFFvM3zzECSBxhj0fIGfqjSdKHB6EldJWqNc68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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