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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '847ffd34654dfa9e6874e7ba59c8905f4e9275be54e69e94c09176b41f6f986b' 
  AND token = 'h8RxOLBycPhqZwx0yJPA9wmn6OlrJn+6fslfVJ0FrQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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