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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fc50ad49e6280450d39c1fe562d79b383243c56656cf0b0be97b4ee65761bca' 
  AND token = 'HgaBQgorx0AhuJ5QI6atZlx8d5cY97oht6IAs9VN4dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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