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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b9aa7f4c7bdbf5dbaec7e1e08d5edfc6b790e98c9ba58f5c7907035913f5689' 
  AND token = 'xfeB6CmrHlAt+NwgWn21fQQy0iG06RXRYUyZanDhUnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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