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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '073fddfb3607743f72ec84660f3b7d31af8b313b3cb85742003a5c21861b76bc' 
  AND token = 'VF2x41UNjzVc0YDsMYP/DkP35NEmBAsay4p8H2y0t00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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