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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0daa42e6131f1b784805392665ed8dcf5781fba232c9a8a351d79d4c3645eda3' 
  AND token = 'rQpRrsWY9FfsqkzkI5uYtg4xWAzfEz20lZYt3heK6HY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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