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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b03a82e2ab330d97e2857fe9f58d18118c82edc33e94753501265c690bb17b64' 
  AND token = '7ZoebCbUIK7akmi383sXe1LrnXlMbmVAObJjD/NwK8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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