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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3333634e4fe10b04af425741ccf8b79990ef5975a36e91be6b5720d896c1f8d2' 
  AND token = 'Tf9yT53q5scJPGm682O3I5zmP64qNyrT5sjiuUxMv8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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