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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35fe233ee21a85de587897a98ae75f9cea60948b527351a4de4a58e6be41d6dd' 
  AND token = 'UftzjeSg48ixqZWutEJDnHztkoI6N3nZ+93TxYEkfTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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