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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03767af34f6d775d9dc3c783f3095f73b74bb716deb01c24555f0156a527bb0a' 
  AND token = 'kFCbBFICsUCI9ZEn3d/J+LKlR2eO3is/BWcs175ZdPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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