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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a60cadb37616856eec40d555b996e463543f1b85bce95ff69590f204417027ab' 
  AND token = 'rDUa+UrLY/iWh79imIfZNE9NkRWvdComj67KDalRVBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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