SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18883718f3ddadfb429b72676fc7d781ff607c15560ef78c439dfbbb5df1ae2c' 
  AND token = 'Cyr5VPrjDxpKiJ5uNpTUK5avPJGw+K9g4jGgW7L4w7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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