SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4299bf8a8218db788924a0700d37c0b8cb7e5cf5b6923676c67318f74bc9b735' 
  AND token = 'y1uPgB2MwI6oSF7DWRXm9FjCVOYDMPxdau++YGZIIow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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