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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62854db46077fe6c0a00ecff3fd13bc291184fefd499cd1eef5815d151827b34' 
  AND token = '5PDXIZZ4riPFSsOKy+ijlk0DEdduZo8xLsFZULQ+6X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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