SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad1888f2e4f24f78fc99db0ceca449a6e9097c967f494f7256569211b8338d27' 
  AND token = 'Hgo7xv6Wk/qsyLJJQzeSb7tQRFT8P+XjI0Rk95HJhMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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