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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71af9e1b4fb23cfc1e44d796d9d7397f8f1e267d41e419815c3ff536c8439969' 
  AND token = 'EwlwnMrFXmqmr/BOWzeYFwTAMVqhokqAiQ5rfT9LtCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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