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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff6c590de98084fbcaedff6a2748c5c607729a14a4eb69bf51f79f118c5c94c1' 
  AND token = 'hMF0D/X8uczIoFGke7EdjzXwbsjuyQMDEXf8ADDKODE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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