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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf9e2849b90f45fc8c897f2d6c6f3bb339b711a1489a96a40c918acdb8a60be3' 
  AND token = '5ldpMvQIyJ/ghZOeTjumUkf1usrpkz4ARtHYHdwuyow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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