SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ebff17f95532784203eda3a76495c213ab5cb0d9884e4f841652b5a1d1ff622' 
  AND token = 'ct66aTPpEZHwCGW2GzNHJYFBw5fdd1QIAX1r/pCZvHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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