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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af767e7a708cfbe3532411e15149ff492d01a04730c56431ba5f8e32afca7433' 
  AND token = 'LagfJKJaqkzZIUFq0D0IZxMbR7jzj3yNVF1phFeX+gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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