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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32df0c5542dedd1a59885a3a85fc88a9f4c83beee3ef73796b767d5a4f148386' 
  AND token = '2pm4QNynnhJhxoZjdC76B/XiZo3UGyHglQe25PppW8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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