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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02598d11717b3d546b165e2c03bcc5bc4328bfa41084d9de46abc0e03876688b' 
  AND token = 'ESqt3RkwesZe4MXxMF7YbSXUxxXCX41xppAh8ABt70E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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