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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7cf11af0bbd777f08d498362499228f8ccafccc991cc0cbd04758e9c791248c' 
  AND token = '3u9rd/VTHJSlFmLQClr+iopMSI5wKjFthdfJFvbFbl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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