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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2644a4b3975bedbe6cd0d4a8c599aae0caea418a08e08fafefe8edccafe7ebc2' 
  AND token = '7wcpoCmwKVT+KW0E49+bQ6V/sbbDEBttxGHtErd+1/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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