SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b022b57cac1b0be1ff5f5e78d4df8e6865f42c941e76dd4ba4a559d49bafdcc0' 
  AND token = 'uQFxPQVrPnyu2mLEgh3OZ0y8XyL+rB2SDOjZhixgFqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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