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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '364a9b29939d7b5a9426c829dfd52d47bdf2a8444883eb42cc567ff1785fab3b' 
  AND token = '42KcCBNCRXT4Lv93atwFJylakZIYAipac5Q7ho3Vaxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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