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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a02af10fcdc4dfbfb504630afeac3d3895fc06eb1ddf842498698736be43df0' 
  AND token = '6K41JK1P57HO8FNg8qpqU5nOI/4+S81WU3nN6pw0Gg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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