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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cb1853c7bcd29cea8bbbd8be0aa65a85e8e715a75cdaac74700f9ad6768b5bb' 
  AND token = 'JlUQrVg9SKV8CeccbClagBmnHwuuMB0zGUf4K2IAxJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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