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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '961d98606f048f4f2f3e9b9b322561328aee66989df1c2b986badf17c5223224' 
  AND token = '6pXt6K4WhXqnK67ANLugsGBuSU6yeNw7e8UZ2BQlgbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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