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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac00a2fcae1bd5f2bd5169d70865ef0bdffb64b99e451a1f63e8c541d52f63ee' 
  AND token = '2DBPfgsQTovAx9+a16NgEoEeVD/52vdAX7+mLvNHqhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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