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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '883ddca4e73f927331104dc4f7cc74958c480bb03a8702f373ae029ce4564421' 
  AND token = 'YdTD48zoNokyqyxW/Wp8UAKVKhcSINZSNR8sdhf8/LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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