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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af1f30edf0ff64811e5ce06a5b80b2a4b8989ec8c39b2735f5affbca38c90ff9' 
  AND token = 'YyHjtrZ9JjufID8g+AsBnA5wZL/iIwRfC9aaqfc8xL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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