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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a5a5271b27faefba06b4896fa67f157d9497b6a6a95361ba6520f55ca024af6' 
  AND token = 'XKlbauLx/3MB3iMPrTONKmycgIMOwIZ++UHxDkk96Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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