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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa65cb6d78c655b10c2002c4363dc7d6af84da606f705de123c5b18aefae45e' 
  AND token = 'BqB33QDTSw6HyapagLv3TFwyc4Yu/Th5FsKjKqw8mNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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