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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1832fe93950a9d132216c11ed24f58df4a7999d5dd089988046b9860576917ab' 
  AND token = 'ZUquTxcOCBmz8iZqqnwLfnF3tHXlrxfSLE1nFxrIpPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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