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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bd2a215707d29e5adb992d7ea76fa9104fa0f9332c368ef71bc1288b3df9409' 
  AND token = 'dO4eFo2Y+0wc1wVvjRkA2Pska+NRz8bivABHqCFDbx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00111

JSON explain

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