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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63cf407687a2131ed80f389aaf9f2df22764c1fd62c699b329e35447ea5dba65' 
  AND token = 'CeyLWGt80EsCowDArURcS+eWjTYDCs1Xyd887xJysjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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