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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7387e2cc1885f005245f9caa7b5eeaddf8b8f0e5c3539ca87a77b154256db4ca' 
  AND token = 'E8/lpAF58Zye2WXX6ZPk469nz+XSOEPUpFqcSMiQXM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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