SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85de80dc9173038e13882fc3f355bea59d5c7d515724c79b45b31e84b55f09b5' 
  AND token = 'VusiRTUN/vbyE2j42HEikt0AyW8XDhC7hJFHCNdmjpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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