SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '629ebafcfa27808112d35584c30e31edd6fa7b4855c3046ef94126597f8278c6' 
  AND token = 'dZ+FMX4Bvqxojjxtm+BYZpQW/K1xg28GmTv7Mky3s1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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