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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f187061e6c3bb05513b8999e640f26bb99514291f1bdba5f606fd843341acc9d' 
  AND token = 'cD119GZArVAAwzPJEY6nwGgd2lvjsesI70vZdlc4Uvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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