SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea690162217b79691dcda3904c5f6020d352a694a7aa31d88c583eff3286db5' 
  AND token = 'zOegBTD0Et2vyGZWOV49z7/L1nUhxTpd2qqSG0mjqyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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