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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0a7d24904bf7e4b7af7ec6700aa0298ff76b63bb612cdc8c967de4ea2ba60bc' 
  AND token = 'gncOQ2uxTkszF+SKu59njQA1RPXCBclqNqUreuXKOWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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