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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd30957ca0014de108a73bb98c300e1bdffedaf1b96ec3a53a51ccf29763293f6' 
  AND token = 'HKHf8M97wAKtC2Qhv5CUpv9V+mBaL5E7SiK5Ewe0PXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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