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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4ad3a8f0c9fac1c0a8de19498540e42e15342f386f1f2745d1ea164aae494a5' 
  AND token = 'lonWwW5Xx8OjEN194unehL48M31pS6Nj4xWF58gqGkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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