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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47ade9857cf2cb005fac80b8dcd96bb58d5668806dda0d99c3904cb66d450ec1' 
  AND token = '7mor04iiRQOZ8HWRwXLIxS6lNPmrTp/z1v8FvEnH5gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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