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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae0ae3da005936a84b4e331292f95fba91da33fa270081ac4ee2d288a95077e1' 
  AND token = 'ulH5Lkw5h+jeD8hLlseUl0MdzA8/1iyOepJdtrsr+vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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