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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db35c9d4edbf4e9feb63539396dc60eebf9b1d41015d0ac460fde57ba2b26ac8' 
  AND token = 'OusNMcihQEsL4G2vsZQcrtgj8Qsj9kfZx/boVZxwkfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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