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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad286be3b53c4ce153c7aece16124c37a8f65600c59130f6100225b6a9c92b9' 
  AND token = 'lfDmfcW2yl6uNSpE1meMu68GQkMLCwYWPcHD3egs8XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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