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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '534e619c408cb1f3a290f113753eab862afdaffbc3119b60876f48792fc4f93f' 
  AND token = 'dtYrmgEmU0hb3HaOZ43yvIpJnnielmYssmhiicSbl8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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