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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ddf6c57e0ad5d535d98a40047e0c878f15a40df0f0c68a57216bdfdf0f5a3ca' 
  AND token = 'IXAfm/0vft+o6+iFSR8ZyPJGU2eAXJyzjDGqKgVbW1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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